Scubapro Bendsamatic! I dropped those 50's off today. Probably get them back early next week sometime.
Also I setup the spare MK5 I mentioned and checked the IP, it is a solid 130psi @3000 and
@300psi
no drift, no creep. I may set up my bench tonight to service the MK5 with the HP failure. If it comes out the same I'll use those 2 MK5s for the project and service the other 2, they are past due anyway.
Added: Broke down the MK5 tonight. Looks like the HP cap may have loosed it took no effort to start the turning to remove. Found the inner HP cap O ring folded in a clump.
Cleaned all the metal in vinegar and warm water, rinsed 'em in warm water then left 'em in Dawn and warm water. Tomorrow I'll finish.